For the long forms, we always need to match both the number and the gender of the owned thing.

Use of Long Forms

The long forms are the ones we place anywhere in the sentence, EXCEPT directly before the noun (the owned thing).

Examples:

La camiseta es mía = The t-shirt is mine.

El coche es suyo = The car belongs to him/her/them/ you (polite).

Las gafas son nuestras = the glasses belong to us.

Possessive Pronouns – Always Long Forms!

Possessive Pronouns’ forms are the long forms we have already seen. What makes them pronouns is that they are placed directly after a definite article (“el – la – los – las”). In that case, they work as full substitutes of the owned thing in the sentence.